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Ford Tractors Discussion Forum

overheating problem

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hawk from decatur

08-12-2013 12:31:46

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1970 ford 4000 3 cyl. gas does anyone know what pressure radiator cap should be used? also was reading a reply about drilling a small hole in thermostat to help my overheating problem? where is this hole drilled at in stat. is 180 degree stat ok in this tractor? can i try and run tractor without stat to see if i have a problem elsewhere? thx

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Sean in PA

08-13-2013 07:18:23

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 Re: overheating problem in reply to hawk from decatur, 08-12-2013 12:31:46  
From what I've read, the people who advocate the hole claim that it allows some of the hot water through to the spring side of the thermostat so the spring opens up at the temperature that it is supposed to. I think that the logic is that if the thermostat seals to good, the heat never gets to the spring to make it open the thermostat until it's too late. I only think this is valid if you've got air on the spring side of the thermostat instead of coolant. If you've got coolant on both sides of the thermostat the heat should transfer through the thin metal of the thermostat plug to the coolant on the other side and the spring should heat up enough without having to drill the hole. If you've got air on the spring side of the thermostat then you should purge the air out of the system and then you won't have to drill the hole.

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08-12-2013 21:09:49

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 Re: overheating problem in reply to hawk from decatur, 08-12-2013 12:31:46  
Volvo recommends that the hole be placed in the highest part of the housing. Supposed to allow it to "burp" or drain off excess air sooner. The same principal may apply here. Others may advise as to the real purpose of the hole.

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08-12-2013 12:44:24

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 Re: overheating problem in reply to hawk from decatur, 08-12-2013 12:31:46  
Running one with out an thermostat can/will cause it to over heat just because it does not have one in it. What happens is the coolant moves to much and to fast to cool down so instead of helping your problem it can/will make it worse. I would do a vinegar flush and see if that helps. Drain the coolant out, fill with vinegar and run it till good and warm. Let cool for say and hour then rig up a hose to the block drain and back flush it. I bet when you drain the vinegar it will be a rust red color

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